From:             jjzhang@gpi.ndf.com
To:               psych.helsinki.fi!eos@avocado.pc.helsinki.fi ('EOS')
Subject:          EOS: More Info About EF 28-135 IS USM Lens
Date sent:        Thu, 26 Mar 1998 09:59:24 +0800
Send reply to:    eos@avocado.pc.Helsinki.FI

Hi,

I bought the EF 28-135 IS USM lens in Beijing yesterday at CNY4,000 (which is
about USD485). I haven't shot any pictures yet. But I think some of you might
be interested in the following information about the lens.

Instead of a sheet of paper as in other EF lenses, this lens comes with an
instruction manual similar to the EOS bodies, that is, a brochure, in Japanese,
English, French, German and Spanish. Following are some of the tips in the manual
about using the IS feature:

. Do not set the IS switch to on when using the camera on a tripod. Doing so
may cause the IS to operate erratically.

. For bulb exposure, turn the IS off to prevent erratic operation. In another
page, the manual says when using bulb exposure: IS function with 700/750
/5/A2/1000/1000N/1000F/1000FN/Rebel/Rebel S/Rebel II/Rebel SII/
500/Rebel XS; IS immediately after exposure with 630/650/RT/620/1/10/10s
/100/Elan; No IS with 1N/1NRS/50/50e/Elan II/Elan IIe/500N/Rebel G/IX/IX Lite
/IX 7/888/5000. (Look at the battery consumption of the different bodies in bulb
exposure. I think this is the reason.)

. With the 50/50e/Elan II/Elan IIe/IX/IX Lite/IX 7, using the self-timer will
disable the IS.

. The image in the viewfinder may shake after the shot is taken with certain
cameras (650/620/630/RT/10/10s/100/Elan). This does not effect the quality of
the photograph.

. The image in the viewfinder may shake when charging the built-in flash for
certain cameras (Substantial image shake: 700/750/10/10s/100/Elan/
1000/1000N/1000F/1000FN/Rebel/Rebel S/Rebel II/Rebel SII, Slight image
shake: 500/Rebel XS/500N/Rebel G/IX/IX Lite/IX 7). This does not effect the
quality of the photograph.

. The IS will not operate effectively in the following circumstances: 1) Subjects
that are moving rapidly; 2) Photographs taken from a moving vehicle.

. The IS does not operate with the manual-focus EF-M camera.

. The image in the viewfinder may shake after using DEP mode with certain
cameras (Substantial image shake: 650/630/RT/1/1N/10/10s/100/Elan, Slight
image shake: 5/A2). 

Hope this can help you decide whether or not to buy this new lens.

Eddie
--
ZHANG, Jingjun (Eddie)
Guang Ping Info., Shanghai, China










From:             jul.loke@utoronto.ca
Date sent:        Wed, 03 Nov 1999 15:28:48 -0800
To:               eos@avocado.pc.Helsinki.fi
Subject:          Re:  EOS: IS technical information
Send reply to:    eos@avocado.pc.Helsinki.fi

timothy a reed  wrote: 
original article:http://www.egroups.com/group/eos/49331.html
> Does anyone know where I can find technical information about the way
> the IS system works?  It could be a magazine, Canon brochure (my local
> camera store doesn't have any), or whatever.

Hi Timothy,

  I am reminded of an old post out of the archives:


which refers to a Canon Link showomg the limitation of
"Conventional Image Stabilization" See:


Image stabilization seems to suppress camera shake by about 95%
if the "shake" is between 2Hz and 20Hz.  Perhaps the new superTeles
have an improvement in the low-frequency (less than 1Hz) range,
but I doubt that even they achieve 100% suppression.

Does this agree with how others interpret the effectiveness of Image
Stabilization?  Any CPS or Canon Insiders with a better explanation?

Cheers
Julian Loke












Date sent:        Tue, 07 Mar 2000 10:14:16 -0500
To:               eos@avocado.pc.Helsinki.FI
From:             Henry Posner/B&H Photo-Video 
Subject:          EOS: Re: Image Stabilization with tripod: how it works?
Send reply to:    eos@avocado.pc.Helsinki.FI

At 05:00 AM 03/07/2000, you wrote:
>I would like to know how image stabilization works when it
>is used in a tripod.

You should visit 
http://www.canon.co.jp/camera-museum/lens/tech/lens/tebure_e.html

--
regards,
Henry Posner
Director of Sales and Training
B&H Photo-Video, and Pro-Audio Inc.
http://www.bhphotovideo.com











From:             "Thys" 
To:               
Date sent:        Tue, 2 Nov 1999 11:27:17 +0200
Subject:          EOS: Re: IS technical information
Send reply to:    eos@avocado.pc.Helsinki.fi


-----Original Message-----
From: Timothy A Reed 

>Does anyone know where I can find technical information about the way the
>IS system works?  It could be a magazine, Canon brochure (my local camera
>store doesn't have any), or whatever.


Timothy

Have you received any info yet?
Canon's Lens Works has a description of how it works, but obviously no
detail technical info.
Canon's technique is essentially a velocity sensor, measured by some
rotational angular velocity sensors, fed back to two correcting motors that
drives a lens group in the opposite direction as the movement. When I first
heard of Canon's concept, I thought they employed some technique that makes use
of the eye control sensors: since they already measured eye movement, I thought
they could as well use the information from the (relative) stable eye position
to drive the correcting motors; but that's obviously not the way it was
implemented. FWIW some chip manufacturers are now coming out with rotational
sensors specifically aimed at the image stabilization market and more
specifically for lens manufacturers. One manufacturer advertised that it will
'give special discount to lens manufacturers'. (forgot the name, but I initially
found it some time ago when I did a search for 'image stabilizer' on Altavista)
I recently saw an ad for a new sensor called the 'Gyrostar' by Murata
(www.murata.com) also aimed at the same market. You might find some useful info
in the datasheets of that sensor. (I guess if Canon's patent has some holes in
it, we will see a host of other Image stabilization lenses not too long from
now)

Regards
Thys van der Merwe
(Richards Bay, South Africa)










From:             "Julian Loke" 
To:               
Subject:          Re: EOS: Supertele IS on tripod (was monopod)
Organization:     University of Toronto
Date sent:        	Sun, 26 Mar 2000 16:21:51 -0500
Send reply to:    eos@avocado.pc.Helsinki.fi

"Chris T. Daida"  wrote:
> I am able to concur with Julian about float not being an optical
> illusion. FYI, the optical IS on Canon's camcorder line also has
> float. It's really obvious when very subtle movements are made. I
> assume Canon's camcorders use a very similar technology as the
> one used in the IS lenses.

Hi Chris,

    The "Parallel-shift" image stabilizer systems on EOS lenses is
different from the Variangle Prism system used in Canon camcorders,
image stabilizer binoculars, and ENG lenses.

Parallel-shift Image Stabilizer on EOS lenses
http://www.canon.co.jp/camera-museum/lens/tech/lens/tebure_e.html

XL1 (EOS-lens compatible digital camcorder)
http://www.canondv.com/xl1/prodinfo/optical.html

10x30 IS binoculars
http://www.usa.canon.com/camcambin/binoculars/10x30is.html

IS-20B II Universal Optical Image Stabilizer Adapter
http://www.usa.canon.com/indtech/broadcasteq/is20bii.html

    I don't know if anyone has tried to use the IS-20B II Variangle Prism
on anything other than a video lens!  At $USD 10000 i suspect not :-)

    The IS-20B II could be Plumviewer's non-magnifying IS Teleconverter,
except that the 3.5lb (1.6kg) device would need to be mounted on
the front of a lens.  And yes, the VAP works mounted on a tripod
or even an 1100ft (430m) building :-)  such as for traffic monitoring:
http://www.usa.canon.com/indtech/broadcasteq/bctv/index.html
http://www.usa.canon.com/indtech/broadcasteq/bctv/ktnv.html

   Maybe this is a fast way but expensive for other competing camera
systems to create Image Stabilizer lenses :-)

Cheers
Julian Loke

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